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Thread: Building A looper Beast

  1. #581
    Team Member R Austin's Avatar
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    Quote Originally Posted by Powerabout View Post
    Perhaps one of those onshaft inline eddy current load cells might be an easier way to measure the output.
    They used them on one European offshore sterndrive class to allow a power to weight specification to be met so I know they are small.
    Looked through out the internet and do not find any eddy current unit that will handle this kind of HP except large dyno units, let alone the one described in your post.

    After some research, it appears a 3 inch wide RPV Silent chain meets the HP requirements, although falls short of meeting the RPM range. That chain/sprocket set comes at a price of about $1400.00 dollars. We will see how the new double row chain holds up before that investment.

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    Quote Originally Posted by R Austin View Post
    Looked through out the internet and do not find any eddy current unit that will handle this kind of HP except large dyno units, let alone the one described in your post.

    After some research, it appears a 3 inch wide RPV Silent chain meets the HP requirements, although falls short of meeting the RPM range. That chain/sprocket set comes at a price of about $1400.00 dollars. We will see how the new double row chain holds up before that investment.
    OK I will try to find it. I do remember seeing an article about the supplier for Class 1 offshore a few years for the European racers. I was sure they said it was an eddy current device so it was the size of a ujoint.

    Shaft torque equipment is quite simple, 2 sensors on a shaft looking at each other and a known shaft material so when it twists it can be calculated on the fly.
    Something like this but the one I remember looked like 2 flanges together and bolted to the the Mercrusier tailstock shaft flanges.
    http://catalog.cooperinstruments.com...rque-load-cell

  3. #583
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    The land-and-sea dynamite dynamometer makes a great water brake, but they are pricey.

  4. #584
    Team Member R Austin's Avatar
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    Quote Originally Posted by Powerabout View Post
    OK I will try to find it. I do remember seeing an article about the supplier for Class 1 offshore a few years for the European racers. I was sure they said it was an eddy current device so it was the size of a ujoint.

    Shaft torque equipment is quite simple, 2 sensors on a shaft looking at each other and a known shaft material so when it twists it can be calculated on the fly.
    Something like this but the one I remember looked like 2 flanges together and bolted to the the Mercrusier tailstock shaft flanges.
    http://catalog.cooperinstruments.com...rque-load-cell


    After reviewing the Cooper instrument site I believe that the unit that you are looking at is just a rotational load cell. Nothing that can be part of a rotating shaft assembly. IE, instead a load cell on the end the arm reading the pumps desire to spin, it would be mounted on the rotational end point of the pump and the other flange mounted to a stationary structure. It reads a twisting, rotational, load. None of the offerings are capable of applying a resistance load.

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    Quote Originally Posted by R Austin View Post
    After reviewing the Cooper instrument site I believe that the unit that you are looking at is just a rotational load cell. Nothing that can be part of a rotating shaft assembly. IE, instead a load cell on the end the arm reading the pumps desire to spin, it would be mounted on the rotational end point of the pump and the other flange mounted to a stationary structure. It reads a twisting, rotational, load. None of the offerings are capable of applying a resistance load.
    I wasnt looking for a friction brake just an easy way to measure torque on a spinning shaft.
    Perhaps using gears is a better way to get your 2:1 load?

  6. #586
    Team Member R Austin's Avatar
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    I have noticed that some of the posts that I had trouble uploading pictures on have appeared again like they were copied over again. That is what really happened because at the time, as I tried, the system notified me that they had to clear a moderator. Not knowing what that meant I just approached the process differently and was successful. Now that Ron changed some of the rules, they popped up.

    Having said all that, "Is there anybody, Ron or anyone that can tell me how to backup or download the entire thread for safe keeping?"
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